The 3M™ Foil Tape 3340 is ideal for sealing rigid fiberglass duct boards and flexible air duct systems. Our tape meets requirements for UL 181 A-P and UL 181 B-FX Listings as a measure of reliability and quality standards.
Features:
- 2.0 mil aluminum foil backing is ideal as a vapor seal tape for duct closure
- Listed for both UL181A-P and UL181B-FX
- Replaces mechanical fasteners for rigid duct board
- Thermally conductive backing helps heating and cooling efficiency
- Permanent acrylic adhesive combined with the durable 2.0 mil backing provides long service life











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